Fix js tag in documentation (#14862)

fix js tag

health/notifications/gotify/README.md

@@ -10,7 +10,7 @@ Learn how to send alerts to your Gotify instance using Netdata's Agent alert not
 
 This is what you will get:
 
-<img src="https://user-images.githubusercontent.com/103264516/162509205-1e88e5d9-96b6-4f7f-9426-182776158128.png" alt="Example alarm notifications in Gotify" width="70%">
+<img src="https://user-images.githubusercontent.com/103264516/162509205-1e88e5d9-96b6-4f7f-9426-182776158128.png" alt="Example alarm notifications in Gotify" width="70%"></img>
 
 ## Prerequisites